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Other Contributions Other Contributions NATURE NOTES Amphibia: Anura Dendropsophus microcephalus. Predation. Dendropsophus microcephalus is a small, arboreal, insectivorous, yel- lowish-orange or tan treefrog (snout–vent length 27–32 mm), characterized by irregular, dark markings, often in the form of an H or X at the level of the shoulders; this species occurs at low elevations along the Gulf and Caribbean slopes from southern Veracruz, Mexico, and across the Yucatan Peninsula to northern Honduras, and on the Pacific slope from Nicaragua to Panama, Colombia, and to the Amazon Basin (Lee, 1996, 2000; Köhler, 2008). During night sampling on 22 April 2016, we observed a Tiger Wandering Spider (Cupiennius salei; family Ctenidae) prey- ing on an adult D. microcephalus at a height of 80 cm above the ground on shrubby vegetation. The spider had subdued the frog by puncturing its dorsum with its chelicerae (Fig. 1A), and soon after began to ingest it (Fig. 1B). The event occurred at Villahermosa, Tabasco, Mexico (17°59'26"N, 92°58'16"W; datum WGS 84; elev. 10 m) in a patch of secondary vegetation at the División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco. Fig. 1. A Tiger Wandering Spider, Cupiennius salei, preying on a Dendropsophus microcephalus at Villahermosa, Tabasco, Mexico. ' © Ana Laura de la Cruz-Ulín Many studies have reported spiders attacking and consuming amphibians (e.g., Menin et al., 2005; Toledo, 2005; Maffei et al., 2010; Palumbo et al., 2012), but to our knowledge this is the first record of a ctenid spider prey- ing on D. microcephalus, an event likely related to the preferentially nocturnal habits of both groups. LITERATURE CITED KÖHLER, G. 2008. Amphibians of Central America. 2nd ed. Herpe- LEE, J. C. 2000. A Field Guide to the Amphibians and Reptiles of ton, Offebach, Germany. the Maya World: The Lowlands of Mexico, Northern Guate- LEE, J. C. 1996. The Amphibians and Reptiles of the Yucatán Pen- mala, and Belize. Comstock Publishing Associates, Cornell insula. Comstock Publishing Associates, Cornell University University Press, Ithaca, New York, United States. Press, Ithaca, New York, United States. MAFFEI, F., F. K. UBAID, AND J. JIM. 2010. Predation of herps by spi- ders (Araneae) in the Brazilian Cerrado. Herpetology Notes 3: 167–170. Mesoamerican Herpetology 1001 December 2016 | Volume 3 | Number 4 Other Contributions Nature Notes MENIN, M., D. J. RODRIGUES, AND C. S. AZEVEDO. 2005. Predation Cycloramphus boraceiensis and the spider Trechaleoides on amphibians by spiders (Arachnida, Araneae) in the Neo- biocellata in the Atlantic Forest of Southeastern Brazil. Her- tropical region. Phyllomedusa 4: 39–47. petology Notes 5: 67–68. PALUMBO, M., L. R. VIERA, C. J. DIAS, AND M. MARTINS. 2012. TOLEDO, L. F. 2005. Predation of juvenile and adult anurans by Predator or prey? Predatory interactions between the frog invertebrates: current knowledge and perspectives. Herpeto- logical Review 36: 395–400. LILIANA RÍOS-RODAS, MARÍA DEL ROSARIO BARRAGÁN-VAZQUEZ, AND MANUEL PÉREZ DE LA CRUZ Laboratorio de Colecciones. División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco Carretera Villahermosa-Cárdenas km. 0.5, entronque a Bosques de Saloya, C. P. 86039, Villahermosa, Tabasco, Mexico. E-mails: [email protected], [email protected], and [email protected] Prevalence and characteristics of overwintering intradermal parasites in Western Narrow-mouthed Toads, Gastrophryne olivacea (Anura: Microhylidae) Larval Hannemania mites, commonly known as chiggers, are known to parasitize several amphibian species (Jung et al., 2000; Sladky et al., 2000) by burrowing intradermally in the stratum spongosium, where they appear as con- spicuous orange to red pustules (Malone and Paredes, 2005). Some of the costs associated with high chigger infec- tions on amphibians include inflammation, necrosis, and reduced mobility (Sladky et al., 2000). One of the infected frogs (Hyla arenicolor) examined by Sladky et al. (2000) died prior to being treated for chiggers, and two more died during the course of treatments with Ivermectin® to remove the mites. Additionally, recent literature suggests that reduced mobility and associated costs in treated individuals likely are a consequence of greater parasite loads on the limbs of the anuran hosts (Malone and Paredes, 2005; Espino del Castillo et al., 2011). Gastrophryne olivacea is one of 22 anuran species known to occur in the Lower Rio Grande Valley of Texas (Dixon, 2013). The distribution of this species extends from southern Nebraska southward to Texas, with isolated populations in Arkansas, Colorado, and New Mexico, in the United States, and in Mexico southward and westward to Chihuahua, Durango, Tamaulipas, and San Luis Potosí (Frost, 2016). Hannemania multifemorala is the only chigger mite known to infect G. olivacea. Intradermal parasite infections of this species, however, have not been described extensively in Texas. On 21 November 2014 from 1800 to 2300 h, we visited Estero Llano Grande State Park, Texas (26.126411°N, -97.956518°W; WGS 84). During our survey, we collected and released 33 individuals of G. olivacea along hiking trails and the fringes of shallow bodies of water throughout the site. All of the examinations were in-situ, and the individuals were released unharmed at the site of collection. The assessment consisted of a visual count of chigger mites, a photograph of each individual, and a record of how many of the mites were present on the dorsal side of the head, vocal sac, forelimbs, thigh, lower hind limbs (tibia and foot), ventral trunk, dorsal trunk, and pelvic patch. For consistency, only one researcher examined all the individuals. During an analysis of our records, we found that the prevalence of infection was 97% (32/33). The mean and median of intensity in the infected individuals of G. olivacea were 14.5 and 6, respectively. We then assessed the normality of the data by using the Shapiro-Wilk test. As the data lacked normality (P < 0.5), we used Friedman’s test to determine significant differences in the level of parasitism among the anuran body regions; this statistic confirms the existence of significant differences in the nine infected anuran body regions (P < 0.0001). We then performed a Nemenyi test to identify the body regions with a significantly different parasite load. We used this post-hoc test, because the sample sizes when comparing the body regions (n = 33) were equal. After performing the post-hoc test, we found that the parasite load on the pelvic patch differed significantly to the one on the head (P < 0.0001), the forelimb (P < 0.01), the thigh (P < 0.0001), the dorsal trunk (P < 0.01), the ventral trunk (P < 0.05), and the vocal sac (P < 0.0001). Additionally, the parasite load on the thigh differed significantly from the one on the head (P < 0.01), the thigh (P < 0.01), and the vocal sac (P < 0.05). Finally, we found statistical differences in parasite load Mesoamerican Herpetology 1002 December 2016 | Volume 3 | Number 4 Other Contributions Nature Notes when comparing the limb to the head (P < 0.01) and the thigh (P < 0.01). From these results, we suggest that the pelvic patch and the thigh might be more parasitized than the remaining predefined body regions of G. olivacea. These results were surprising, as previous work has shown that chigger mite infections typically are greater on the hind limbs, and not on the pelvic seat. We performed all statistical analyses using R. v. 3.1.2. For anuran species, the energetic and physiological consequences of high parasite loads are poorly under- stood. Beyond showing lesions and swollen extremities, which may limit locomotion, the individuals appeared healthy. Due to the nature of the parasite/host relationship, we believe that high larval Hannemania infestations do not cause direct mortality, but instead increase the risk of mortality by reducing the ability of the host to escape predators, and possibly disrupt the water and electrolyte balance in the host owing to the relatively high surface area being affected on a small species such as G. olivacea. Heavy parasitism of the pelvic seat might be particularly deleterious in frogs, as McClanahan and Baldwin (1969) stated that in Anaxyrus punctatus the pelvic patch accounts for only 10% of an individual’s surface area, but produces 70% of the water uptake by dehydrated A. punctatus. Surveys and ongoing monitoring of the population of G. olivacea at this site and others are being scheduled to encompass a full year of surveys to determine seasonal outbreaks and the possible effects on their behavior and mortality. Additionally, we suggest a comparative study among populations from different localities to determine if habitat characteristics (e.g. water quality parameters) create a more conducive environment for enabling greater Hannemania infections on amphibian assemblages occurring at given sites. Finally, we were unable to identify the Hannemania mite to species level, as we did not observe any adults. Our present goal is to identify the species of Hannemania that infects this population of G. olivacea, as only one reported species of Hannemania, from the state of Kansas, has been documented (Walters et al., 2011). Fig. 1. (A, B) Two individuals of Gastrophryne olivacea examined in the current study displaying the high prevalence of chigger mites, Hannemania sp., near near the pelvic plate and the thigh area. ' © Mayra Oyervides Acknowledgments.––We especially thank the staff at Estero Llano Grande State Park for after hour access to the study site and their continued support. Our collections were made under Texas Parks and Wildlife Scientific Permit for Research (SPR-0913-130). Additionally, we thank Dr. Tamer Oraby for his advice in conducting the sta- tistical analyses, and Michael Forstner for comments on a draft of the manuscript. RP was supported by NIH grant 5R25GM100866-02 564, awarded to Robert K. Dearth and Jason G.
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